One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10,12,14)(11,15,16,13)(17,18,22,25)(19,23,26,30)(20,21,24,29)(27,28,31,32)(2,6)(3,8)(9,10,12,14)(11,13,16,15)(17,19)(18,23)(20,27)(21,28)(22,26)(24,31)(25,30)(29,32)(1,3)(2,4)(5,8)(6,7)(9,10)(11,13)(12,14)(15,16)(19,26)(23,30)(27,31)(28,32) involution — undirected(1,4)(2,3)(5,7)(6,8)(9,11,12,16)(10,13,14,15)(17,19)(18,23)(20,27)(21,28)(22,26)(24,31)(25,30)(29,32)(17,20)(18,21)(19,27)(22,24)(23,28)(25,29)(26,31)(30,32) involution — undirected(17,21)(18,24)(19,28)(20,25)(22,29)(23,31)(26,32)(27,30) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.